Stopping piracy of avast! pro- what can we do?

Avast Free Antivirus / Premium Security
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I suggested this in Reply #2 and jadinolf confirmed he had (but no further feedback from ebay) in Reply #3

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I can say if you wanna buy a license key of the Pro. I would say to buy on the real trusted website and its Avast!. Because you know its not a fake license key.

Mr.Agent